Bob and Mike Bryan have announced that their coach, David MacPherson, has stopped working with them and has taken a college coaching position.

The record-setting twins worked with MacPherson for 11 years.

"As tough as it is to part ways, it is also an exciting time for him, as Macca has accepted the head coaching job at George Washington University," they wrote on their Facebook page. "It is a great opportunity for Macca to continue coaching high-level players, and be able to enjoy more time at home with his family.

"Mike and I are extremely grateful for not only his loyal friendship, but for his tireless effort and dedication to our careers."

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They added that he would always be "part of the family."

Having long been the dominant team in men's doubles, the Bryans—who finished 2015 ranked No. 1—have dropped to No. 5 in the rankings. The Americans have won three titles this season, in Houston, Barcelona and Rome.

They are currently the second seeds in Cincinnati.